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  1. #1
    New Member
    Join Date
    Feb 2013
    Posts
    1
    Location
    forestburgh, ny
    Tractor
    john deere mt40

    Default mt 40 ran good 3 days ago now its back firing

    Hey there friends i just got an MT40 by proxy i dont know much about it, it ran fine three days ago. Went to use it today and its backfiring through the carb, changed the plugs no help....its the first cylinder thats te problem i pulled the wire off and the back fire stoped, switched plugs around and the wires still no good....can someone tell me what it could be??

    thanx in advance

  2. #2
    Platinum Member
    Join Date
    May 2003
    Posts
    623
    Location
    NE PA
    Tractor
    AC 5020, Gravely Com12, JD M, JD X300R, WH 16 Auto

    Default Re: mt 40 ran good 3 days ago now its back firing

    Maybe a crack, moisture, corosion in the distributor cap?

  3. #3
    New Member
    Join Date
    May 2013
    Posts
    5
    Location
    Chicora, PA
    Tractor
    1949 John Deere Model M

    Default Re: mt 40 ran good 3 days ago now its back firing

    Quote Originally Posted by js5020 View Post
    Maybe a crack, moisture, corosion in the distributor cap?
    That would be the first thing that I would check as well. I had a similar issue after I tuned my model M up and it ran great for a day or two then started runing bad and backfiring. It turned out that a strap on the set of points that I installed was intermittantly shorting out. I put another set of points in it and that fixed the problem.

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